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Allen Chartier, www.amazilia.net
J.D. Willson, SRELHERP staff, www.uga.edu/srelherp/lizards/phrcor.htm
John Hollister, www.herpo.com/trans-pecos/lizards/phryno.html
John Moser, USDA Forest Service, www.forestryimages.org


M. Clark, http://whozoo.org/AnlifeSS2001/natdavid/NGD_HornedLizard.htm
Manaster, Jane. Horned Lizard. Austin Texas: University of Texas Press, 1997. 29 March 2007.


Mike T. Friggens, Project Manager, Sevilla LTER,http://sevilleta.unm.edu/data/species/reptile/socorro/profile/texas-horned-lizard-map.gif


Moody, Raymond W., et al. Iguana. 14 San Jose, CA: International Reptile Conservation Foundation, 2007. 29 March 2007.


Sherbrooke, Wade C. "Rain-Harvesting in the Lizard, Phrynosoma cornutum: Behavior and Integumental Morphology." Herpetology. 24.3 (1990): 302-308. 29 March 2007.
Texas Parks and Wildlife Department,  http://www.tpwd.state.tx.us/learning/texas_nature_trackers/horned_lizard/

Todd, R. 2000. "Phrynosoma cornutum" (On-line), Animal Diversity Web. Accessed April 08, 2007 at http://animaldiversity.ummz.umich.edu/site/accounts/information/Phrynosoma_cornutum.htm/.


Wendy Hodges, 2001, "Phrynosoma cornutum" (On-line), Digital Morphology. Accessed April 8, 2007 at http://digimorph.org/specimens/Phrynosoma_cornutum/head/.


I would just like to thank everyone for the use of their pictures and their information.